package cn.kwq.project_manger.chat;
import java.io.IOException;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArraySet;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;

import cn.hutool.core.util.StrUtil;
import com.alibaba.fastjson2.JSON;
import com.alibaba.fastjson2.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import lombok.extern.slf4j.Slf4j;
/**
 * Created with IntelliJ IDEA.
 *
 * @Author: kwq
 * @Date: 2022/12/23/23:55
 * @Description:
 */
@Component
@Slf4j
@ServerEndpoint("/ws/{userId}")  // 接口路径 ws://localhost:9090/ws/userId;
public class WebSocket {

    @Autowired
    ChatServiceImpl chatServiceImpl;

    /**静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。*/
    private static int onlineCount = 0;
    /**concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。*/
    private static ConcurrentHashMap<Long,WebSocket> webSocketMap = new ConcurrentHashMap<>();
    /**与某个客户端的连接会话，需要通过它来给客户端发送数据*/
    private Session session;
    /**接收userId*/
    private Long userId;

    /**
     * 连接建立成功调用的方法*/
    @OnOpen
    public void onOpen(Session session,@PathParam("userId")Long userId) {
        this.session = session;
        this.userId=userId;
        if(webSocketMap.containsKey(userId)){
            webSocketMap.remove(userId);
            webSocketMap.put(userId,this);
            //加入set中
        }else{
            webSocketMap.put(userId,this);
            //加入set中
            addOnlineCount();
            //在线数加1
        }

    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        if(webSocketMap.containsKey(userId)){
            webSocketMap.remove(userId);
            //从set中删除
            subOnlineCount();
        }
        log.info("用户退出:"+userId+",当前在线人数为:" + getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息*/
    @OnMessage
    public void onMessage(String message, Session session) {
        log.info("用户消息:"+userId+",报文:"+message);
        //可以群发消息
        //消息保存到数据库、redis
        if(StrUtil.isNotBlank(message)){
            try {
                log.info("已接收报文");
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }

    /**
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("用户错误:"+this.userId+",原因:"+error.getMessage());
        error.printStackTrace();
    }

    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message) throws IOException {
        this.session.getAsyncRemote().sendText(message);
    }


    /**
     * 发送自定义消息
     * */
    public void sendInfo(String message
            ,@PathParam("userId")Long userId
            ,@PathParam("formId")Long fromId) throws IOException {
        log.info("发送消息到:"+userId+"，报文:"+message);
        if(webSocketMap.containsKey(userId)){
          JSONObject json = new JSONObject();
          json.put("from",fromId);
          json.put("msg",message);
            webSocketMap.get(userId).sendMessage(json.toJSONString());
        }else{
            log.error("用户["+userId+"]不在线！");
        }
    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        WebSocket.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        WebSocket.onlineCount--;
    }


}

